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首页> 外文期刊>Estuarine Coastal and Shelf Science >Dynamics of mercury species in surface sediments of a macrotidal estuarine―coastal system (Adour River, Bay of Biscay)
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Dynamics of mercury species in surface sediments of a macrotidal estuarine―coastal system (Adour River, Bay of Biscay)

机译：潮汐河口-沿海系统（比斯开湾的阿杜尔河）表面沉积物中汞物种的动态

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摘要

Estuarine and coastal surface sediments from the Adour estuary and adjacent coastal area (South Bay of Biscay) have been investigated to establish mercury species variability in a macrotidal system submitted to contrasted seasonal river discharges and downstream urbanisation. Surface sediments were sampled during three campaigns in the major sediment deposits of the Adour estuary and at selected discharge points. Concentrations of Hg~(2+) and MeHg~+ in Adour estuarine sediments average 1600 and 1.3 pmol g~(-1), and range from <2 to 7300 pmol g~(-1) and from < 0.5 to 8.0 pmol g~(-1), respectively. The concentrations of inorganic ionic mercury (Hg~(2+)) and monomethylmercury (MeHg~+) in the surface sediments display large seasonal variation, being one order of magnitude higher in June 2001 for Hg~(2+) and in October 2000 for MeHg~+. The results show that Hg~(2+) can be accumulated in the estuarine sediments after seasonal river inputs and both remobilised and methylated during dry period. Mercury species concentrations in coastal sediments collected in June 2001 assessed the impact of estuarine inputs on the nearby coastal area. Except direct anthropogenic discharge points, the variability and transfer of Hg~(2+) and MeHg~+ in surface sediments of the whole estuarine―coastal macrotidal system can be depicted by simple geochemical parameters of the bulk sediments, such as grain size distribution, organic carbon and total sulphur.
机译：已经对阿杜尔河口和邻近沿海地区（南比斯开湾）的河口和沿海地表沉积物进行了调查，以确定在季节性河水排放和下游城市化形成对比的大潮系统中汞物种的变异性。在三个活动期间，对Adour河口的主要沉积物沉积物和选定的排放点进行了表面沉积物采样。 Hg〜（2+）和MeHg〜+在Adour河口沉积物中的平均浓度为1600和1.3 pmol g〜（-1），范围从<2至7300 pmol g〜（-1）和<0.5至8.0 pmol g 〜（-1）。表层沉积物中的无机离子汞（Hg〜（2+））和一甲基汞（MeHg〜+）的浓度表现出较大的季节性变化，分别于2001年6月和2000年10月高出一个数量级。对于MeHg〜+。结果表明，Hg〜（2+）可在季节性河水输入后积聚在河口沉积物中，在干旱期既可迁移也可甲基化。 2001年6月收集的沿海沉积物中的汞物种浓度评估了河口投入物对附近沿海地区的影响。除了直接的人为排放点外，整个河口-沿海巨潮系统表层沉积物中Hg〜（2+）和MeHg〜+的变异性和转移都可以通过简单的大颗粒沉积物地球化学参数来描述，例如粒度分布，有机碳和总硫。

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